Color Options - Inadequate. Some people might like the pictures offered. I prefer a solid color but the colors offered leave a lot to be desired. They're either dark and dull or bright and eye-piercing. We need some "pastel" offerings.
Email Size Column - Missing. This is important information to some people. Yes we can see the size of an attachment AFTER the email is opened, but I would like to see the size of the whole email BEFORE I open it so I can decide whether I want to open it.
Black Buttons (Compose Message, Delete, Reply, etc.) - Why black?? How depressing!! How hard can it be to make them match the chosen color scheme?
Full Headers Link - Missing. It used to be SO EASY to see full headers - one click and there they were. Now I have no idea how to see them or even IF they can be viewed.